incrustation|incrustations

贝壳在船体上形成了坚硬的钙质沉积层。

The ___incrustation of seashells on the ship's hull created a hard calcium deposit.

船底覆盖着一层厚厚的贝壳和藻类形成的硬壳。

The boat's hull was covered with thick ___incrustations of shells and algae.

浴缸底部结了一层厚厚的矿物沉积物。

There was a thick ___incrustation of mineral deposits at the bottom of the bathtub.